METHOD FOR REAGENT TREATMENT OF WELL Russian patent published in 1995 - IPC

FIELD: mining industry. SUBSTANCE: method for reagent treatment of well includes reagent treatment of well to open producing formation and to produce useful product. Treatment provides for successive injection of several process solutions: reagents with acid or alkali reaction, reacting with mud fill of natural or technological origin and also with rock of producing formation. In so doing, the following sequence of injection of reagent process solution in formation is observed. First, solution of base reagents with alkali (pH 8) or acid (pH 1) is injected depending on the type of mud fill and held in well for reaction for at least 4 h (preferably 4-8 h), then, solution with neutral reaction (pH 7) is injected and held in well for at least 2 h (preferably 2-4 h), and the sequence of process operations may be repeated. Further on, sequence of operations is repeated but with base solution reagent being polar with pH of medium. With formation pressure less than 0.3-0.5 of initial formation pressure after treatment with each process solution, removed from well is process solution and formation fluid up to attaining fluid of contact composition. EFFECT: increased well efficiency producing hydrocarbons, drinking, thermal and industrial waters, mineralized solutions due to effective action on mud fill and permeability of well zone by reagent treatment. 2 cl, 4 tbl